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二次 數値的 模型에 의하 Kinematic Stirling Engine의 設計 및 分析
金福錫,徐相龍,金在煐 順天大學校 農業科學硏究所 1990 農業科學硏究 Vol.4 No.-
A design method of kinematic Stirling engine with rhombic-drive was proposed. The design method using a mathematical model was for determination of dimensions of important engine elements to results high performance of the engine in terms of thermal efficiency at given design conditions. The proposed design method was used to design an engine 1kW power output, and performances of the designed engine at various operating conditions were predicted by second order mathematical model to give suggestion to improve the performance of the engine. Heat transfer areas of heater, regenerator and cooler were found out as important design parameters of the engine. The design method proposed in this study was considered as desirable because magnitude of the parameters were optimized by the method with consideration of the complex interlocked effects of the parameters on the thermal efficiency of the engine. The designed engine was expected to have 0.93kW and 28.2% of brake power output and overall thermal efficiency respectively, at the design conditions of the 30% of coolant temperature, 700˚C of heater heating temperature, 3.0MPa of engine mean pressure and 2000rpm of engine speed. Performance of the designed engine in terms of thermal efficiency and power output could be improved by increasing heater heating temperature and engine mean pressure, however, it would have limits because materials of the engine was limits of resistance to high temperature and stress. Thermal efficiency of the engine could be increased by speed up the engine up to the design speed of 2000rpm.
CNG Dual Fuel 디젤기관의 성능과 배출가스 개선을 위한 수소혼합 실험
김복석,Masahiri Shioji 한국에너지학회 2000 에너지공학 Vol.9 No.2
In this study, the performance and pollutant emission of CNG engine using diesel oil as a source of ignition, so called CNG dual fuel diesel engine is considered by experiment. One of the unsolved problems of the natural gas dual fuel engine is that there is too much exhaust of total hydrocarbon (THC) at a low equivalent mixture ratio. To fix it, a natural gas mixed with hydrogen was applied to engine test. The results showed that the higher the mixture ratio of hydrogen to natural gas, the higher the combustion efficiency. and when the amount of the intake air is reached to 90% of WOT, the combustion efficiency was promoted. But, like a case making the injection timing earlier, the equivalent mixture ratio for the knocking limit decrease and the produce of NOx increases.
김복석 ( Bok Seok Kim ),양규원 ( Kyu-won Yang ),조은비 ( Eun Bee Cho ),유현아 ( Hyeon A Ryu ),유명선 ( Myung Seon Yu ),김혁주 ( Hyuck Joo Kim ) 한국농업기계학회 2016 한국농업기계학회 학술발표논문집 Vol.21 No.2
매실의 낙과 피해를 일으키는 복숭아씨살이좀벌은 땅에 떨어진 핵과류 속에서 유충상태로 월동하고, 노숙유충은 이듬해 봄에 번데기를 거쳐 성충으로 우화하며, 이 성충은 매실나무의 매실핵이 경화되기 전에 산란관을 통해 산란을 함으로서 매실이 낙과하여 그 피해가 상당하다. 이 피해를 줄이고자 낙과된 매실을 수집하여 파괴하는 기계를 개발하여 사용하게 함으로서 씨살이좀벌의 성충을 줄이고, 그 피해를 저감하고자 낙과매실수집파쇄기를 개발하였다. 연구 개발된 낙과매실수집파쇄기의 결론을 요약하면 다음과 같다. 1. 충 구제약제를 살포하지 않은 유기농 매실을 생산하는 농가는 가장 큰 피해를 주는 씨살이좀벌에 의한 낙과 손실을 줄일 수 있을 것으로 사료된다. 2. 매실 과수원에서 어린잡초 위에 낙과 매실을 수집한 결과 평균 수집률이 1차 69.2%와 2차 10.5% 내외를 수집할 수 있어서 개발된 수집파쇄기를 활용하면 씨살이좀벌의 기주를 퇴치하는 기계로 그 효과가 클 것으로 사료된다. 3. 수집파쇄기의 동력원으로 소형 2행정기관을 탑재하고, 일정한 기어 감속비에 의해 축출한 동력을 V 벨트풀리를 통해 감속하여 롤 파쇄기를 회전시켜 수집된 매실 핵을 파괴하는 실험은 비교적 우수한 것으로 나타났다.
정사각형 단면의 90˚곡관내 난류유동 특성에 관한 연구
문찬,김복석,김홍빈 순천대학교 공업기술연구소 1995 工業技術硏究所論文集 Vol.9 No.-
The fields of turbomachinery and electrical generators provide many examples of flow through internal passages, at the range of Reynolds Numbers occuring in practice. The flow motion is three dimensional and highly turbulent in most of cases. An adequate understanding. for the characteristic of these turbulent flow is needed for the design of thermo-fluid machinary with a good efficiency. The effect of the curvature on th structure of turbulence in the curved passage have been extensively by many workers, but the effects of curvature have not been well understood inspite of the impotance of the phenomena in the practical design process. In this study, the characteristics of the three-dimensional turbulence flow in a square sectioned 90o bend were investigated by numerical simulation and experiment, and the results were compared with the results obtained by simulation with four near wall turbulence models and experiments.